Furnace.



No. 633.349. Patented sept. '19, |399.

w. & .1. c. swl'NnELL.

'FUBNACL (Alipucacion med may e, 1899.) No Model.) 2 sheets-sheet WITNESSES: INVENTORS,

No. 633,349. Y Patented Sept. I9, |899. W. & J. C. SWINDELL.

FURNAGE.

(Applicatiun filed May 8, 1899,)

2 Sheets-Sheet 2.

QNo Model.)

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UNITED STATES PATENT OFFICEQ WILLIAM SWINDELL AND JOHN C. SVINDELL, OF ALLEGIIENY, PENNSYLVANIA.

FU RNACE.

SPECIFICATION forming part of Letters Patent N o. 633,349, dated September 19, 1899. Application iiled May 8, 1899. Serial NoA 715,920. (No model.)

To a/ZZ whom, 2 5 may concern:

Be it known'that We, WILLIAM SWINDELL and JOHN C. SWINDELL, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful Improvement in Furnaces, of which im provement the following is a specification.

Our invention relates more particularly to metallurgical furnaces adapted for heating, reheating, or annealing by the employment of gaseous fuel; and its object is to provide a furnace in Whichahigh and uniform degree of heat may be imparted to the material which is subjected to treatment and an economical consumption offuel be attained, the construction of the furnace being such that the accessory supply, heating, and waste flues may be built or repaired without interference with the combustion-chamber or furnacechamber proper.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure lis a longitudinal section through a furnace embodying our invention, taken at the line o a of Fig. 3; Fig. 2, asimilar section at the line I) b of Fig. 3; Fig. 3, a horizontal section at the linee c of Fig. 2; Fig. 4, a similar section at the line d d of Fig. 5; Fig. 5, a transverse section at the line e e of Fig. 4, and Fig. 6 a

similar section at the line ff of Figs. 2 and 3.

In the practice of our invention we construct a furnace having a combustion-chamber 1, which is ordinarily square or rectangular in horizontal section above its floor 2 and which is provided with a series of gas and air fines,

to be presently described, below its floor. The combustion-chamber lis inclosed by and between the floor 2, an arched top or roofB, side walls 4, and end Walls 5, openings 6, closed by doors 7, being formed in one ofthe walls for the insertion and removal of the articles j which are to be heated or annealed, as the case may be. imparted to the combustion-chamber and its contentsby the combustion of a mixture of gas and Aheated air, which is supplied to the combustion-chamber through a series of 'lues located below its floor and through supplypassages formed in one of its walls, the es- The required degree of heat is sentia] features of which flues and passages are as follows:

A pipe 9, controlled by a'suitable valve in the ordinary manner, leads from a gas-producer or othersource of gas-supply to a gassupply chamber S, which adjoins the end of the combustion-chamber 1, and is provided near its top with a plurality of gas-supply ports 1l, through which gas is admitted to the combustion-chamber and distributed with substantial uniformitythroughout the width thereof for admixture with the proper proportion of heated air, which is admitted to the combustion-cham ber through air-su pply ports 15, located above and adjacent to the gassupply ports 11. Access to the gas-supply chamber 8 is` afforded through an opening 22, controlled by a door 23.

An air-admission flue or conduit 12, the inlet-opening of which may be controlled by a suitable valve or register, communicates at its inner end with a transverse air-distribution flue 12, located below the furnace.' The tlue'12a communicates by ports l2b with a plurality of air-heating flues 13, which extend longitudinally below the furnace and are located on opposite sides of and separated by comparatively thin walls from a plurality of waste-gas lues 1G 19, to be presently described. The air-heating ilues 13 communicate through ports 13 at their ends farther' 'thin walls from the combustion-chamber and from said waste-gas fines, so that the currents 'passing thro ughthem may be heated thereby.

The air-heating flues 14 lead into air-supply chambers 15, which adjoin the gas-supply chamber, and the heated air passes from the chambers 15 into the combustion-chamber through the air-supply ports 15a, which, as

before stated, are located'above and adjacent to the gas-supply ports 11. The currents of gasand heated air passing out of the ports 11 and 15L commingle adjacent to the delivery ends of said ports and the resultant mix- IOO ture is ignited and burned in the combustionchamber, imparting a high degree of heat thereto.

The waste gases are discharged from the combustion-chamber through ports 17,located at the end of the chamber farther from the gas and air supply ports,into waste or discharge ues 16, which extend longitudinally below and throughout the length of the combustion-chamber. Each of the waste-fines 16 is located immediately below one of the airheating iues 14 and is interposed between two of the air-heatingiiues 13. The wasteiiues 16 are connected by transverse iiues 18 with return waste-fines 19, extending parallel with the waste-fines 16 toa common stack 20, their communication with which is controlled by valves or dampers 21. The relation of the return waste-dues 19 to thc air-heating ilues is the same as that of the waste-fines 1Gthat is to say, cach of the iues 19 is lo- Acated immediately below one of the air-heat ing flues 14 and is interposed between two of the air-heating flues 13. Each of the wasteilnes is thus adjoined on three sides by airheating flues, and the heat of the escaping products of combustion is thereby effectively utilized in heating the incoming currents of air. The speciiic disposition of the wasteiues 1G and 19 in pairs on opposite sides of a central stack, as shown and described, is not an essential of our invention, as a transverse iiue 1S, similar to those shown, might without variation of operative principlev be employed to connect the two tlues 19 and the waste gases be conducted continuously in altermately-reversed directions through the system of lues 16 19.

In the operation of the furnace gas from the source of supply passes through the pipe 9 into the gas-'chamber S and thence through the gas-supply ports into the combustionchamber 1. Air enters at the outer end of the adlnission-conduit 12 and thence passes in divided currents through the air-heating ues 13 and returns in opposite directions through the air-heating fines 14 to the airsupply chambers 15, from which it is discharged into the combustion-chamber through the air-supply ports 15,`which are in close proximity to the gas-supply ports 11. The gas and air meet and are mingled adjacent to the outlets of the ports S and 15 and the mixture is ignited and burns in the combustion-chamber, the heat evolved being exerted upon the metal or other material placed therein. The hot products of combustion pass from the combustion-chamber by the ports 17 into the waste-fines 1G and thence through the connecting-hues 1S and waste-flues 19 to the stack 20. In their passage through the ues 16 and 19 their heat is imparted to the walls thereof and thence to the currents of air passing through the air-heating fines 13 14 on three sides thereof to the combustion-chamber. The heat of the waste gases is thoroughly and effectively utilized before their escape into the stack, and the form of the system of iiues and their relation to the combustion-chamber are such that they maybe constructed, renewed, or repaired without interference with the furnace proper.

Ve claim as our invention and desire to secure by Letters Patent- 1. In'a furnace, the combination of a combustion-chamber, gas-supply ports communieating with said chamber at the end thereof, means for supplying gas to said ports, discharge-ports in the vertical wall of said combustion chamber opposite the gas supply ports, waste-lines, leading underneath the combustion -chamber from said dischargeports to a point of exit, horizontal air-flues above said waste-fines and extending between the same and the ioor of the combustionchamber, lateral air-fines adjacent the sides of the waste-fines and communicating with said horizontal air-iiues at one end, a transverse air-fine beneath said lateral air-fines and communicating therewith at the other end, means connecting said transverse liuc to the atmosphere and means connecting said horizontal iiues to the combustion-chamber.

2. In a furnace, the combination ofacombustion-chamber, gas and air supply chambers adjoining a wall of the combustionchamber and communicating by supply-ports therewith, discharge-ports leading out of the combustion chamber adjacent to the end thereof farther from the gas and air supply ports, waste-fines communicating with the discharge-ports and leading therefrom, below the combustion-chamber, to a point of discharge, a transverse air-distribution flue located below the furnace and communicating with an air-inlet, a system of air-heating ilues extending on opposite sides of the waste-fines, and connected by ports at one end with the air-distribution Ii ue, and a system of air-heating `[iues communicating with the flues of the Iirst speciiied system at their ends farther from the air-distribution Hue, and leading from such communication, between the Wastei'lnes and the oor of the combustion-chamber, into the air-supply chamber.

WILLIAM SWINDELL. JOI-IN C. SWINDELL. Witnesses:

J. SNoWDEN BELL, CLARENCE A. WILLIAMS.

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